/* xeditor 落地页 —— 淡雅浅色风格 */
:root {
  --bg: #f7f8fb;
  --bg-alt: #eef1f7;
  --card: #ffffff;
  --card-hover: #f5f7fc;
  --line: rgba(45, 65, 105, 0.12);
  --text: #26324a;
  --muted: #64748f;
  --accent: #4a6bd6;
  --accent-2: #7a63d6;
  --green: #2f9e85;
  --radius: 14px;
  --maxw: 1080px;
  --shadow: 0 12px 40px rgba(30, 50, 90, 0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
code {
  font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  background: rgba(74, 107, 214,0.12);
  color: #3f5cc4;
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 0.9em;
}
.link { color: var(--accent); border-bottom: 1px dotted var(--accent); }

/* ---------- 顶栏 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 248, 251, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 8px; color: #fff; font-weight: 800;
}
.brand-sub { color: var(--muted); font-weight: 400; font-size: 0.82em; margin-left: 4px; }
.nav-links { display: flex; gap: 22px; margin: 0 auto; font-size: 0.95em; }
.nav-links a { color: var(--muted); transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-cta { display: flex; gap: 10px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-lg { padding: 13px 28px; font-size: 1.05em; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 6px 24px rgba(74, 107, 214,0.35);
}
.btn-primary:hover { box-shadow: 0 8px 30px rgba(74, 107, 214,0.5); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { background: rgba(74, 107, 214,0.08); }

/* ---------- Hero ---------- */
.hero {
  padding: 92px 20px 70px;
  text-align: center;
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(74, 107, 214,0.18), transparent 70%),
    radial-gradient(40% 40% at 15% 30%, rgba(122, 99, 214,0.12), transparent 70%);
}
.hero-eyebrow {
  color: var(--green);
  letter-spacing: 2px;
  font-size: 0.85em;
  font-weight: 600;
  text-transform: uppercase;
}
.hero-title { font-size: clamp(2.1rem, 5vw, 3.3rem); margin: 18px 0; line-height: 1.2; }
.grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  max-width: 720px;
  margin: 0 auto 30px;
  color: var(--muted);
  font-size: 1.08em;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; }
.hero-stats {
  display: flex; gap: 40px; justify-content: center;
  margin-top: 54px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; align-items: center; }
.stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label { color: var(--muted); font-size: 0.9em; margin-top: 2px; }

/* ---------- Section 通用 ---------- */
.section { padding: 76px 20px; max-width: var(--maxw); margin: 0 auto; }
.section.alt { max-width: none; background: var(--bg-alt); border-block: 1px solid var(--line); }
.section.alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 { font-size: 1.9rem; margin-bottom: 10px; }
.section-head p { color: var(--muted); }

/* ---------- 能力卡片 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.2s, background 0.2s, border-color 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  background: var(--card-hover);
  border-color: rgba(74, 107, 214,0.35);
}
.card-icon { font-size: 1.6rem; margin-bottom: 12px; }
.card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 0.95em; }

/* ---------- 技术亮点 ---------- */
.highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}
.hl {
  display: flex; gap: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.hl > span { font-size: 1.5rem; }
.hl h4 { margin-bottom: 6px; }
.hl p { color: var(--muted); font-size: 0.92em; }

/* ---------- 场景 ---------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}
.scenario {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s, border-color 0.2s;
}
.scenario:hover { transform: translateY(-3px); border-color: rgba(74, 107, 214,0.4); }
.scenario h4 { margin-bottom: 10px; color: var(--accent); }
.scenario p { color: var(--muted); font-size: 0.94em; }

/* ---------- API 表 ---------- */
.api-table {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.api-table table { width: 100%; border-collapse: collapse; min-width: 560px; }
.api-table th, .api-table td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.api-table th { background: var(--card); color: var(--muted); font-weight: 600; }
.api-table tr:last-child td { border-bottom: none; }
.api-table td code { white-space: nowrap; }

/* ---------- 在线体验（Demo） ---------- */
.demo {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.demo-pane {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 30px rgba(30, 50, 90, 0.08);
}
.demo-head {
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 241, 247,0.5);
}
/* 请求/结果两个面板用不同色条的头部，便于快速区分上下两块 */
.demo-req .demo-head { border-left: 3px solid var(--accent); }
.demo-res .demo-head { border-left: 3px solid var(--green); }
.demo-kicker {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  font-weight: 600;
}
.demo-kicker::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}
.demo-res .demo-kicker { color: var(--green); }
.demo-res .demo-kicker::before { background: var(--green); }
.demo-head h3 { font-size: 1.05rem; margin-top: 4px; }

.pg-tabs { display: flex; border-bottom: 1px solid var(--line); }
.pg-tab {
  flex: 1;
  background: transparent;
  color: var(--muted);
  border: none;
  padding: 12px 14px;
  cursor: pointer;
  font-size: 0.9em;
  border-bottom: 2px solid transparent;
}
.pg-tab.active { color: var(--text); border-bottom-color: var(--accent); }
.pg-pane { display: none; padding: 18px; flex: 1; }
.pg-pane.active { display: flex; flex-direction: column; }
.pg-json {
  background: #f4f6fb;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  font-size: 0.8em;
  overflow: auto;
  white-space: pre;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  max-height: 360px;
}
.pg-run-row {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 14px;
}
.run-ico { font-size: 0.85em; margin-right: 2px; }
.pg-status { color: var(--muted); font-size: 0.9em; }
.pg-status.ok { color: var(--green); }
.pg-status.err { color: #ff6b6b; }

/* 步骤条 */
.demo-steps {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 14px 18px;
  gap: 6px;
  border-bottom: 1px solid var(--line);
}
.demo-steps li {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: var(--muted);
  opacity: 0.5;
  transition: opacity 0.2s;
}
.demo-steps li i {
  font-style: normal;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--card-hover);
  border: 1px solid var(--line);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 11.5px;
  flex: none;
}
.demo-steps li.active { color: var(--text); opacity: 1; }
.demo-steps li.active i { background: var(--accent); border-color: var(--accent); color: #fff; }
.demo-steps li.done { color: var(--green); opacity: 1; }
.demo-steps li.done i { background: var(--green); border-color: var(--green); color: #062; }
.demo-steps li.err { color: #ff6b6b; opacity: 1; }
.demo-steps li.err i { background: #ff6b6b; border-color: #ff6b6b; color: #fff; }

/* 结果区 */
.demo-out { padding: 18px; display: flex; flex-direction: column; gap: 16px; flex: 1; }
.demo-out-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.demo-block h6 {
  color: var(--muted); font-size: 0.85em; margin-bottom: 8px; font-weight: 600;
}
.demo-block pre {
  background: #f4f6fb;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.85em;
  max-height: 300px;
  min-height: 120px;
  overflow: auto;
  white-space: pre-wrap;
}
.demo-frame {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 10px;
  min-height: 120px;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  font-size: 0.85em;
}
.demo-frame img { max-width: 100%; max-height: 320px; display: block; border-radius: 6px; }
.demo-dl {
  border-top: 1px dashed var(--line);
  padding-top: 14px;
  display: flex; align-items: center; min-height: 44px;
  color: var(--muted); font-size: 0.9em;
}
.demo-dl .btn-ghost { font-size: 13px; padding: 9px 16px; }

/* ---------- CTA / footer ---------- */
.cta {
  text-align: center;
  padding: 84px 20px;
  background:
    radial-gradient(50% 60% at 50% 0%, rgba(53, 208, 165, 0.12), transparent 70%);
}
.cta h2 { font-size: 1.8rem; margin-bottom: 12px; }
.cta p { color: var(--muted); margin-bottom: 26px; }
.footer { text-align: center; padding: 34px 20px; color: var(--muted); border-top: 1px solid var(--line); }
.footer-meta { font-size: 0.82em; margin-top: 6px; opacity: 0.7; }

/* ---------- 登录弹窗 ---------- */
.modal-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(20, 30, 60, 0.4);
  backdrop-filter: blur(4px);
  display: grid; place-items: center;
  padding: 20px;
}
/* display:grid 会覆盖 hidden 属性（UA display:none），必须显式声明才能关闭弹窗 */
.modal-mask[hidden] { display: none; }
.modal {
  position: relative;
  width: 100%; max-width: 400px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px;
}
.modal-close {
  position: absolute; top: 14px; right: 14px;
  background: transparent; border: none; color: var(--muted);
  font-size: 16px; cursor: pointer;
}
.modal-close:hover { color: var(--text); }
.modal h3 { margin-bottom: 6px; }
.modal-sub { color: var(--muted); font-size: 0.88em; margin-bottom: 18px; }
.modal .field { margin-bottom: 14px; }
.modal .field > span {
  display: block; color: var(--muted);
  font-size: 0.85em; margin-bottom: 6px;
}
.modal input[type="tel"], .modal input[type="text"],
.modal input[type="password"] {
  width: 100%;
  background: #f4f6fb;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  padding: 11px 14px;
  font-size: 1em;
  outline: none;
}
.modal input:focus { border-color: var(--accent); }
/* 登录方式 Tab：手机号 / 账户 */
.auth-tabs { display: flex; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.auth-tab {
  flex: 1; padding: 9px 0; background: transparent; border: none;
  color: var(--muted); font-size: 0.92em; cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.auth-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.auth-pane[hidden] { display: none; }
/* 账户模式切换链接（登录 ↔ 注册） */
.auth-toggle {
  margin-top: 10px; text-align: center;
  color: var(--muted); font-size: 0.85em;
}
.auth-toggle a { color: var(--accent); cursor: pointer; text-decoration: none; }
.auth-toggle a:hover { text-decoration: underline; }
.code-row { display: flex; gap: 10px; align-items: flex-end; }
.code-row .field-code { flex: 1; }
.code-row .btn { flex: none; }
/* 算式验证码行：算式展示 + 输入 + 换一题 */
.captcha-row { display: flex; gap: 10px; align-items: flex-end; }
.captcha-row .field-code { flex: 1; }
.captcha-row .btn { flex: none; }
.captcha-inline { display: flex; gap: 8px; align-items: center; }
.captcha-inline input { flex: 1; }
.captcha-expr {
  flex: none; min-width: 4.2em;
  padding: 10px 12px;
  background: #eef1f7; border: 1px solid var(--line);
  border-radius: 10px; color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1em; font-weight: 600; text-align: center;
  user-select: none;
}
.login-err {
  color: #ff6b6b; font-size: 0.86em;
  min-height: 1.4em; margin-bottom: 6px;
}
.btn-block { width: 100%; }
.modal-hint { color: var(--green); font-size: 0.84em; margin-top: 12px; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* 体验区未登录提示条 */
.pg-login-hint {
  max-width: 640px; margin: 0 auto 26px;
  text-align: center;
  background: rgba(122, 99, 214,0.1);
  border: 1px dashed rgba(122, 99, 214,0.4);
  color: #6b5ad6;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 0.9em;
}

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 测试页扩展样式 ---------- */

/* 输入源选择条 */
.source-row {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 241, 247,0.5);
  font-size: 0.9em;
  flex-wrap: wrap;
}
.source-row label {
  color: var(--muted);
  cursor: pointer;
  display: flex; align-items: center; gap: 6px;
}
.source-row input[type="radio"] { accent-color: var(--accent); }
.source-select {
  background: #f4f6fb; color: var(--text);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 6px 10px; font-size: 0.85em;
  outline: none; min-width: 120px;
}
.source-select:disabled { opacity: 0.5; }
.source-label {
  color: var(--accent);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  border: 1px solid rgba(74, 107, 214,0.35);
  border-radius: 999px;
  padding: 3px 11px;
  white-space: nowrap;
}
.source-info { color: var(--muted); margin-left: auto; font-size: 0.85em; }

/* 一级/二级分类 Tab */
.pg-cats {
  display: flex; flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 241, 247,0.3);
}
.pg-cat {
  flex: 1; min-width: 90px;
  background: transparent; border: none;
  color: var(--muted); padding: 11px 8px;
  cursor: pointer; font-size: 0.88em;
  border-bottom: 2px solid transparent;
}
.pg-cat.active {
  color: var(--text);
  border-bottom-color: var(--accent);
  background: rgba(74, 107, 214,0.08);
  font-weight: 600;
}

.pg-subtabs {
  display: none; flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
}
.pg-subtabs.active { display: flex; }
.pg-subtab {
  background: transparent; border: none;
  color: var(--muted); padding: 9px 14px;
  cursor: pointer; font-size: 0.85em;
}
.pg-subtab.active {
  color: var(--text);
  background: rgba(74, 107, 214,0.16);
  box-shadow: inset 0 -2px 0 var(--accent);
  font-weight: 600;
}

/* 端点面板容器 */
.pg-panes {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 可编辑 JSON */
.pg-json-editor {
  width: 100%; flex: 1; min-height: 220px;
  background: #f4f6fb; color: var(--text);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 14px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.8em; line-height: 1.5;
  resize: vertical; outline: none;
}
.pg-json-editor:focus { border-color: var(--accent); }

/* 说明文字 */
.pg-desc {
  color: var(--muted);
  font-size: 0.85em;
  margin-bottom: 10px;
}

/* 参数面板 */
.pg-params {
  display: flex; flex-wrap: wrap; gap: 12px;
  margin: 12px 0; padding: 10px 12px;
  background: rgba(238, 241, 247,0.4); border-radius: 10px;
}
.pg-params label {
  color: var(--muted);
  font-size: 0.85em;
  display: flex; align-items: center; gap: 6px;
}
.pg-params input, .pg-params select {
  background: #f4f6fb; color: var(--text);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 6px 10px; font-size: 0.9em;
  outline: none;
}

/* 小按钮 */
.btn-sm { padding: 6px 12px; font-size: 0.85em; }

/* ops 构建器 */
.ops-builder { margin: 10px 0; }
.ops-add-row { display: flex; gap: 10px; align-items: center; margin-top: 8px; }
.ops-list { display: flex; flex-direction: column; gap: 10px; }
.ops-item {
  background: #f4f6fb; border: 1px solid var(--line);
  border-radius: 10px; padding: 12px;
}
.ops-item header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.ops-item h6 { color: var(--accent); font-size: 0.9em; }
.ops-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.ops-fields label { color: var(--muted); font-size: 0.8em; display: flex; flex-direction: column; gap: 4px; }
.ops-fields input, .ops-fields select {
  background: #eef1f7; color: var(--text);
  border: 1px solid var(--line); border-radius: 6px;
  padding: 6px 8px; font-size: 0.9em;
}

/* 结果区增强 */
#out-meta { min-height: 80px; max-height: 320px; }
#out-preview { min-height: 120px; }
.demo-out .demo-block pre { white-space: pre-wrap; word-break: break-word; }

/* 面板内边距继承 */
.pg-pane { display: none; padding: 18px; flex: 1; flex-direction: column; }
.pg-pane.active { display: flex; }

/* 结果区头部与全屏 */
.demo-res .demo-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.demo-head-title { display: flex; flex-direction: column; }
.demo-head-title h3 { margin-top: 2px; }

/* 全屏：左右两栏一起进入全屏 */
#demo:fullscreen,
#demo:-webkit-full-screen {
  width: 100vw; height: 100vh;
  padding: 24px;
  background: var(--bg);
  overflow: auto;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 20px;
  border-radius: 0;
}
#demo:fullscreen .demo-pane,
#demo:-webkit-full-screen .demo-pane {
  max-height: calc(100vh - 48px);
}
#demo:fullscreen .demo-frame img,
#demo:-webkit-full-screen .demo-frame img { max-height: 72vh; }
#demo:fullscreen .demo-out-row,
#demo:-webkit-full-screen .demo-out-row { grid-template-columns: 1fr; }

/* 预览图可点击放大 */
.demo-frame img {
  cursor: zoom-in;
  transition: transform 0.2s, box-shadow 0.2s;
}
.demo-frame img:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(30,50,90,0.15);
}

/* 图片灯箱 */
.img-lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(20, 30, 60, 0.82);
  backdrop-filter: blur(6px);
  display: grid; place-items: center;
  padding: 40px;
  cursor: zoom-out;
}
.img-lightbox img {
  max-width: 100%; max-height: 100%;
  border-radius: 10px;
  box-shadow: 0 24px 80px rgba(30,50,90,0.25);
  cursor: default;
}
.img-lightbox .lb-close {
  position: absolute; top: 18px; right: 24px;
  color: var(--text); font-size: 28px; line-height: 1;
  cursor: pointer; opacity: 0.7;
}
.img-lightbox .lb-close:hover { opacity: 1; }

/* ---------- 在线查看器板块 ---------- */
.viewer-intro {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.viewer-features {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 28px;
  text-align: left;
  margin: 0 auto 34px;
  max-width: 640px;
}
.viewer-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text);
  font-size: 0.98em;
  line-height: 1.5;
}
.viewer-features li span { font-size: 1.15rem; line-height: 1.2; }
.viewer-features code {
  background: rgba(74, 107, 214,0.12);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0 5px;
  font-size: 0.9em;
  color: var(--accent);
}
.viewer-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 演示资源（功能介绍区顶部） ----------
 * 类名用 demo-samples 前缀，避免与 playground 右侧 RESULT 面板（.demo-pane.demo-res）撞名 */
.demo-samples {
  max-width: 720px;
  margin: 0 auto 44px;
  text-align: center;
}
.demo-res-title { font-size: 1.05rem; color: var(--text); margin-bottom: 6px; }
.demo-res-sub { color: var(--muted); font-size: 0.92em; margin-bottom: 20px; }
.demo-res-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.demo-res-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  text-align: left;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}
.demo-res-card:hover {
  transform: translateY(-3px);
  border-color: rgba(74, 107, 214,0.45);
  background: var(--card-hover);
}
.demo-res-file {
  font-weight: 600;
  color: var(--text);
  font-size: 1em;
  word-break: break-all;
}
.demo-res-desc { color: var(--muted); font-size: 0.86em; }
.demo-res-open {
  margin-top: 4px;
  color: var(--accent);
  font-size: 0.88em;
}
.demo-res-open:hover { text-decoration: underline; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .demo { grid-template-columns: 1fr; }
  .demo-out-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
  .source-row { gap: 10px; }
  .pg-cat { min-width: 70px; padding: 10px 4px; font-size: 0.8em; }
  .viewer-features, .demo-res-grid { grid-template-columns: 1fr; }
}

/* ---------- 任务队列（异步转换：提交即返回 taskId，实时展示） ---------- */
.task-queue {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(30, 50, 90, 0.08);
  margin-bottom: 22px;
  overflow: hidden;
}
.task-queue-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 241, 247,0.5);
  border-left: 3px solid var(--accent);
}
.task-queue-head h4 { margin: 0; font-size: 1rem; }
.task-queue-meta { color: var(--muted); font-size: 0.85em; }
.task-queue-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 18px;
}
.task-card {
  background: #f7f9fd;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
}
.task-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.task-type { color: var(--accent); font-weight: 600; font-size: 0.92em; }
.task-badge {
  font-size: 0.78em;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.3px;
}
.badge-queued { background: rgba(74, 107, 214,0.14); color: var(--muted); }
.badge-running { background: rgba(74, 107, 214,0.16); color: var(--accent); animation: taskPulse 1.6s ease-in-out infinite; }
.badge-done { background: rgba(53, 208, 165, 0.15); color: var(--green); }
.badge-failed { background: rgba(255, 107, 107, 0.15); color: #ff6b6b; }
@keyframes taskPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(74, 107, 214,0.35); }
  50% { box-shadow: 0 0 0 6px rgba(74, 107, 214,0); }
}
.task-card-meta {
  display: flex;
  gap: 16px;
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.82em;
  flex-wrap: wrap;
}
.task-card-meta code {
  background: rgba(74, 107, 214,0.12);
  color: var(--text);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 0.95em;
}
.task-card-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
.task-error {
  margin-top: 8px;
  color: #ff6b6b;
  font-size: 0.82em;
  word-break: break-all;
}